Looking for a PWM chip number.

You don't mention frequency, but I would look into a dual comparator, one half set up to make a triangle wave generator and the the other to compare that triangle with the signal being converted to a PWM output. For modest frequencies, you might get by with an LM393.

Ok, I'll look into that, I think i've done something like the before where I used a single reference driving both inputs as common mode and then offsetting one side.

Thanks for the heads up. Most likely will do just fine. We have lots 393's kicking around in our tubes.

UC384x series.

Tim

-- Deep Fryer: A very philosophical monk. Website @

Ok, had a look. to much over head. I currently have an 8 PDIP that works but starts at 30 volts and does not seem to be a common stock item.

LM393 was suggested to do what I need. something that I over looked which i've done in the past for some other project.. I just need a simple 0..100 % duty cycle pulse with minimum over head. This is not going to be a smps.. I just needed the function of an integral IC used in smps to keep the part count down and space limited. The Cw frequency is going to be nothing more than 10khz on the average. Thanks for the suggestions.

I originally used a PIC chip how ever, I've had experience with those getting corrupted programs if you don't exercise all the protection precautions. In the end, the part count and cost out weights a simple linear circuit.